9
UNIVERSITY OF THE WITWATERSRAND, JOHANNESBURG SCHOOL OF MECHANICAL, INDUSTRIAL AND AERONAUTICAL ENGINEERING MECN 3007 – THIRD YEAR ENGINEERING LABORATORY FORMAL REPORT Title: Pump Performance Laboratory Name: Kyle Bailey Group 29 Student Number: 442 563 Date: 13 th March 2012 i

Pump Performance Lab Report

Embed Size (px)

Citation preview

Page 1: Pump Performance Lab Report

UNIVERSITY OF THE WITWATERSRAND, JOHANNESBURG

SCHOOL OF MECHANICAL, INDUSTRIAL AND AERONAUTICAL ENGINEERING

MECN 3007 – THIRD YEAR ENGINEERING LABORATORY

FORMAL REPORT

Title: Pump Performance Laboratory

Name: Kyle Bailey Group 29

Student Number: 442 563

Date: 13th March 2012

i

Page 2: Pump Performance Lab Report

UNIVERSITY OF THE WITWATERSRAND, JOHANNESBURG

SCHOOL OF MECHANICAL, INDUSTRIAL AND

AERONAUTICAL ENGINEERING

INDIVIDUAL DECLARATION WITH TASK SUBMITTED FOR ASSESSMENT

I, (name) ___________________________________________, (Student number: _______________) am registered for

Course No. ____________, (course name) __________________________________

_____________________________________________________________ in the year 20 _________.

I herewith submit the following task, “ (title) ______________________________________________

_________________________________________________________________________________”

in partial fulfillment of the requirements of the above course.

I hereby declare the following:

o I am aware that plagiarism (the use of someone else’s work without their permission and / or without acknowledging the original source) is wrong;

o I confirm that the work submitted herewith for assessment in the above course is my own unaided work except where I have explicitly indicated otherwise;

o This task has not been submitted before, either individually or jointly, for any course requirement, examination or degree at this or any other tertiary educational institution;

o I have followed the required conventions in referencing the thoughts and ideas of others;

o I understand that the University of the Witwatersrand may take disciplinary action against me if it can be shown that this task is not my own unaided work or that I have failed to acknowledge the source of the ideas or words in my writing in this task.

Signature: ____________________________ Date: __________________________ 20 ______

ii

Page 3: Pump Performance Lab Report

ABSTRACT

A pump performance experiment was conducted on a Matheson and Bremner Norma Flow NF 32 160 centrifugal type water

pump. Head rise, efficiency of the pump and power were analysed with varying flow rate and a series of dimensionless pump

performance curves set up to better observe the results and determine the performance of another pump within the same

family and compare our own data with that supplied by the manufacturers. Initially, calibration testing on the static head of

the system and the output motor torque (converted and read as a force) had to be conducted and curves set up to ascertain

whether or not the data would be accurate. The flow rate of the system was varied by means of a spear (control) valve and

the pressure was measured by means of a differential pressure transducer placed in the system. The experiment was

conducted for 3 different motor speeds whilst varying the flow rate at ten different intervals for every speed setting and

recording the resulting pressure and force. The dimensionless coefficients for this family of pumps were then computed and

the dimensionless curves for the system sketched. Upon comparing the estimated performance values of another pump with

those of the manufacturer’s specification, deviations were found and as such, no conclusive evidence was determined that

the performance curves obtained by plotting the experimental data were valid. The discussion section of this report discusses

possible reasons for these deviations.

iii

Page 4: Pump Performance Lab Report

TABLE OF CONTENTS

DECLARATION ii

ABSTRACT iii

TABLE OF CONTENTS iv

LIST OF FIGURES v

LIST OF TABLES vi

NOMENCLATURE vii

1. INTRODUCTION 1

1.1 BACKGROUND 1

1.2 MOTIVATION 2

1.3 OBJECTIVES 2

2. APPARATUS 3

3. EXPERIMENTAL PROCEDURE 4

3.1 CALIBRATION 4

3.2 METHOD 4

3.3 SAFETY PRECAUTIONS 4

4. OBSERVATIONS 5

4.1 CALIBRATION TABLES 5

4.2 CALIBRATION RUNNING PLOTS 6

4.3 PRIMITIVE RECORDED DATA 7

5. DATA PROCESSING 8

6. RESULTS 9

7. ESTIMATING PERFORMANCE VALUES 13

8. DISCUSSION 14

9. CONCLUSION 15

10. APPENDIX A – CALIBRATION CURVES 16

11. APPENDIX B – UNCERTAINTY ANALYSIS 17

12. APPENDIX C – MANUFACTURER’S SPECIFICATIONS 21

13. REFERENCES 22

iv

Page 5: Pump Performance Lab Report

LIST OF FIGURES

Figure 1: A Centrifugal Pump....................................................................................................................................................vii

Figure 2: Diagram of Norma Flow Centrifugal Pump................................................................................................................ix

Figure 3: Pressure reading vs. Flow Rate Running Plot............................................................................................................xii

Figure 4: Force Reading vs. Flow Rate Running Plot..............................................................................................................xiii

Figure 5: Power Versus Flow Rate..........................................................................................................................................xvii

Figure 6: Efficiency Versus Flow Coefficient.........................................................................................................................xvii

Figure 7: Head Coefficient Versus Flow Coefficient..............................................................................................................xvii

Figure 8: Power Coefficient Versus Flow Coefficient...........................................................................................................xviii

Figure 9: Head Versus Flow Rate...........................................................................................................................................xviii

Figure 10: Head Versus Flow Rate For 165mm Impellor Pump...............................................................................................xx

Figure 12: Calibration Curve For The Transducer...................................................................................................................xxii

Figure 13: Calibration Curve For The Strain Gauge................................................................................................................xxii

v

Page 6: Pump Performance Lab Report

LIST OF TABLES

Table 1: Transducer Calibration Results.....................................................................................................................................xi

Table 2: Strain Gauge Calibration Results.................................................................................................................................xii

Table 3: Raw Data Taken At n = 1230 RPM…………… .......................................................................................................xiv

Table 4: Calibrated Values for n = 1230 RPM...........................................................................................................................xv

Table 5: Calibrated Values For n = 1840 RPM.........................................................................................................................xvi

Table 6: Calibrated Values For n = 2450 RPM.........................................................................................................................xvi

Table 7: Estimated Performance Values For Pump...................................................................................................................xx

vi

Page 7: Pump Performance Lab Report

NOMENCLATURE

Variable Description Units

ω Rotational speed [rad/s]

ρ Density of water [kg/m³]

CH Dimensionless head coefficient [1]

CP Dimensionless power coefficient [1]

CQ Dimensionless flow coefficient [1]

d Impeller diameter [m]

g Gravity [m/s²]

H Head rise [m]

h Height [m]

n Impeller rotational speed [rev/s]

P Power [W]

Q Flow rate [m³/s]

T Torque [N.m]

vii

Page 8: Pump Performance Lab Report

viii